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<h1>About commands</h1>

<p>The HTML Help API supports a set of commands (<i>uCommand</i> values) that enable you to access functionality programmatically.</p>

<p>The most basic of the commands is <a href="cmd_hh_display_topic.htm">HH_DISPLAY_TOPIC</a>, which enables you to open a compiled help (.chm) file in a specific help window and display a specific topic within the help file.</p>  

<h2>Commands quick reference</h2>

<table border=1 cellpadding=3 cellspacing=0 width=100%>
<TR VALIGN="top">
<TH>Category</TH>
<TH>Commands</TH>
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<TR VALIGN="top">
<TD>
<h3>Window types</h3>
</TD>
<TD>
<UL>
<LI><a href="cmd_hh_close_all.htm">HH_CLOSE_ALL</a></LI>
<LI><a href="cmd_hh_get_win_handle.htm">HH_GET_WIN_HANDLE</a></LI>
<LI><a href="cmd_hh_get_win_type.htm">HH_GET_WIN_TYPE</a></LI>
<LI><a href="cmd_hh_set_win_type.htm">HH_SET_WIN_TYPE</a></LI>
</UL></TD>
</TR>

<TR VALIGN="top">
<TD>
<h3>Context-sensitive help</h3>
</TD>
<TD>
<UL>
<LI><a href="cmd_hh_display_text_popup.htm">HH_DISPLAY_TEXT_POPUP</a></LI>
<LI><a href="cmd_hh_display_topic.htm">HH_DISPLAY_TOPIC</a></LI>
<LI><a href="cmd_hh_help_context.htm">HH_HELP_CONTEXT</a></LI>
<LI><a href="cmd_hh_tp_help_contextmenu.htm">HH_TP_HELP_CONTEXTMENU</a></LI>
<LI><a href="cmd_hh_tp_help_wm_help.htm">HH_TP_HELP_WM_HELP</a></LI>
</UL></TD>
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<TR VALIGN="top">
<TD>
<h3>Keyword lookups</h3>
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<TD>
<UL>
<LI><a href="cmd_hh_alink_lookup.htm">HH_ALINK_LOOKUP</a></LI>
<LI><a href="cmd_hh_keyword_lookup.htm">HH_KEYWORD_LOOKUP</a></LI>
</UL></TD>
</TR>

<TR VALIGN="top">
<TD>
<h3>Navigation pane</h3>
</TD>
<TD>
<UL>
<LI><a href="cmd_hh_display_index.htm">HH_DISPLAY_INDEX</a></LI>
<LI><a href="cmd_hh_display_search.htm">HH_DISPLAY_SEARCH</a></LI>
<LI><a href="cmd_hh_display_toc.htm">HH_DISPLAY_TOC</a></LI>
</UL></TD>
</TR>

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<TD>
<h3>Error messages</h3>
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<TD>
<UL>
<LI><a href="cmd_hh_get_last_error.htm">HH_GET_LAST_ERROR</a></LI>
</LI>
</UL></TD>
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<TD>
<h3>Contents synchronization</h3>
</TD>
<TD>
<UL>
<LI><a href="cmd_hh_sync.htm">HH_SYNC</a></LI>
</LI>
</UL></TD>
</TR>


<TR VALIGN="top">
<TD>
<h3>Single threading</h3>
</TD>
<TD>
<UL>
<li><a href="cmd_hh_initialize.htm">HH_INITIALIZE</a></li>
<LI><a href="cmd_hh_pretranslatemessage.htm">HH_PRETRANSLATEMESSAGE</a></LI>
<li><a href="cmd_hh_uninitialize.htm">HH_UNINITIALIZE</a></li>
</UL>
</TD>
</TR>

<br>
<table border="0" cellpadding="0" cellspacing="4">
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<td valign="top"><a href="ov_html_help_api_overview.htm"><img src="home.gif" width=20 height=18 alt="link to overview topic" border="0"></a>
</td>
<td><a href="ov_html_help_api_overview.htm">About the HTML Help API</A>
</td>
</tr>
<tr>
<td>&nbsp;
</td>
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